70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
/* $Id$ */
|
|
/*
|
|
* (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
|
|
*
|
|
* This product is part of the Amsterdam Compiler Kit.
|
|
*
|
|
* Permission to use, sell, duplicate or disclose this software must be
|
|
* obtained in writing. Requests for such permissions may be sent to
|
|
*
|
|
* Dr. Andrew S. Tanenbaum
|
|
* Wiskundig Seminarium
|
|
* Vrije Universiteit
|
|
* Postbox 7161
|
|
* 1007 MC Amsterdam
|
|
* The Netherlands
|
|
*
|
|
*/
|
|
|
|
/* Author: J.W. Stevenson */
|
|
|
|
#include "pc.h"
|
|
|
|
#define assert(x) /* nothing */
|
|
|
|
#if __STDC__
|
|
#include <float.h>
|
|
#define HUGE_DIG DBL_MAX_10_EXP /* log10(maxreal) */
|
|
#else
|
|
#define HUGE_DIG 400 /* log10(maxreal) */
|
|
#endif
|
|
#define PREC_DIG 80 /* the maximum digits returned by _fcvt() */
|
|
#define FILL_CHAR '0' /* char printed if all of _fcvt() used */
|
|
#define BUFSIZE HUGE_DIG + PREC_DIG + 3
|
|
|
|
void _wrf(int n, int w, double r, struct file* f)
|
|
{
|
|
char *p, *b;
|
|
int s, d;
|
|
char buf[BUFSIZE];
|
|
|
|
if (n < 0 || w < 0)
|
|
_trp(EWIDTH);
|
|
p = buf;
|
|
if (n > PREC_DIG)
|
|
n = PREC_DIG;
|
|
b = _fcvt(r, n, &d, &s);
|
|
assert(abs(d) <= HUGE_DIG);
|
|
if (s)
|
|
*p++ = '-';
|
|
if (d <= 0)
|
|
*p++ = '0';
|
|
else
|
|
do
|
|
*p++ = (*b ? *b++ : FILL_CHAR);
|
|
while (--d > 0);
|
|
if (n > 0)
|
|
*p++ = '.';
|
|
while (++d <= 0)
|
|
{
|
|
if (--n < 0)
|
|
break;
|
|
*p++ = '0';
|
|
}
|
|
while (--n >= 0)
|
|
{
|
|
*p++ = (*b ? *b++ : FILL_CHAR);
|
|
assert(p <= buf + BUFSIZE);
|
|
}
|
|
_wstrin(w, (int)(p - buf), buf, f);
|
|
}
|